Method of making hinges



June 30, 1925. 1,544,329

I J. P. M KINNEY. JR

METHOD OF MAKING HINGES Filed Nov. 1, 1922 Patented June 30, 1925.

i UNITED STATES:

JAMES P. MCKINNEY, 33., OF PITTSBURGH, PENNSYLVANIA.- 1

METHOD or MAKING HINGES.

Application filed No vember 1, 19 22. Serial No. 598,361.

To aZZ whO m z'tmay concern. p I Be it known that I, J AMES P. MOKlNNEY,J12, a citizen of the United Statesgandresidentof Pittsburgh, in thecounty ofAllegheny and State of Pennsylvania,'have invented a new anduseful Improvement in Methods of Making Hinges; and I do hereby declarethe following to be a full, clear, and exact description thereof.

My invention relates to a method of forming hinges, and more especiallywhat are known as butt-hinges. There is a type of butt-hinges on themarket which is provided with anti-friction bearings interposed betweenthe knuckles,

either in the form of ball-bearings or Washers formed ofanti-frictionmetal, so that the doorconnected up to said hinges will swing easily andwithout noise, and atthe same time the wear'onthe hinges will be reducedto a minimum. 3 Y

In order to secure these bearings in place on the middle knuckle of oneof the leaves of the hinge, so as to be freely movable thereon and yetheld from becoming misplaced when the leaves are separated, it has beencustomary to employ a bushing in said knuckle, said bushing extendingbeyond the ends of said knuckle to receive the bearings, whereupon thebushing is flared at the ends to hold the bearings securely in positionon the knuckle. To provide for the insertion of this bushing it isnecessary to drill the bore in the knuckle of a larger size than theother knuckles, the bushing when inserted forming a bore in the knuckleof the same size as the bores in the other knuckles for the reception ofthe connecting pintle.

In the formation of the knuckles the metal lugs from which the knucklesare formed are all bent at one operation, and the drill is then insertedto give an accurate bore to receivethe pin. here the bushing is employedin the middle knuckle, however, as stated above, it is necessary todrill the bore in the middle knuckle larger than the bores in the otherknuckles, and to do this it was necessary to pry open either the loweror upper knuckle sufiiciently to allow the drill to have access to themiddle knuckle. This bending of the metal back after it had once beenbent was very inconvenient and troublesome, and furthermore the bendingof the metal back after having once been bent tended to weaken the metalat this point, and after the large bore had been drilled in the middleknuckle the metal of the upper or lower knuckle had to be bent back toits original shape. After this the smaller drill was inserted to drillthe upper and lower knuckles with bores corresponding to the bore formedby the bushing to receive the,

connecting pintle. I

The object of my invention is to provide a method of forming such hingeswithout the necessity of bending back or opening up the metal of one ofthe butts to insert the large drill to drill the 'bore in the middleknuckle, thereby greatly reducing the time required in drilling andconsequently re'-' ducing the cost of manufacture.

To these ends my invention consists, gen-- erally stated, in drillingthe bo'res'in the upperand middle knuckles at the same time both ofthesame diameter, that'is, so that the middle knuckle when the'bushingis inserted therein will have a'bore'o'f a diameter equal to the lowerkn'uckle, and employing a connecting pintle with an enlarged portion atits upper end fitting snugly within the large bore formed in the upperknuckle at the same time that the correspondingly sized opening wasformed in the middle knuckle to receive the bushing.

In theaccompanying drawing, Fig. 1 is a View of two leaves of abutt-hinge separated and showing the large bore being drilled in theupper and middle knuckle; and Fig. 2 shows the assembled hinge.

In the drawing, the numeral 2 designates one leaf of an ordinarybutt-hinge, and 3 the other leaf. The leaf 2 has the lugs to form theknuckles 4:, 5 and 6 bent in the ordinary manner. A suitable drill 7 isinserted in the upper knuckle 4, and the bore in said knuckle increasedto the size of said drill, whereupon the drill then passes into themiddle knuckle 5 to form a bore of like size therein. When the drill haspassed through both knuckles 4 and 5 it is withdrawn, and the lowerknuckle 6 is then drilled by the introduction of a drill of smallerdiameter than the drill 7, and said knuckle 6 is also tapped'to form theseat 8.

A bushing 9 is then inserted in the middle knuckle 5, said bushing beingpreferably formed of a split-tube which fits snugly in the bore, and isof a length to project beyond both ends of said knuckle. The bushingwithin the knuckle forms a bore through said knuckle corresponding tothe size of the bore in the lower knuckle 6.

A connecting pint-1e 12 passes downthrough the knuckles 4, 5 and 6, aswellas through the knuckles 13 and 14 of the leaf 3 which have beendrilled in the ordinary manner to form bores corresponding to the boresin the knuckles 5 and 6 of the leaf 2.

' 13 and 14 of the leaf 3.

This pintle has the enlarged upper portion 15 which fits snugly in thecorrespondingly sized bore in the knuckle 4 formed by the large drill 7,while the main shank 16 of said pintle is of smaller diameter to fitsnugly in the bushing 9 and the bore in the knuckle 6, as wellas thebores in the knuckles The upper end of the pintle 12 has the customaryspherical top 16*, and the correspondingly shaped. bottom piece 17 isscrewed into the threaded seat 8 in the lower knuckle 6.

By my invention, therefore, I provide the bore for the bushing 9 in the'middle knuckle without having to pry or open up'one of the'upper orlower knuckles in order to get the drill into said middle knuckle toform open up one of the knuckles,or by bending the central knucklebefore end knuckles. V

What I claim is:

bending the two The method of forming butt-hinges,

which consists in providing a leaf member having three vertically spacedknuckles, drilling bores in the upper knuckle and middle knuckle of saidleaf at one'drilling operation, making the opening in said middleknuckle sufficiently large to receive a bushing having a borecorresponding to the bore subsequently drilled in the lower knuckle,

drilling said bore in said lower knuckle, inserting the bushing in saidmiddle knuckle,

providing a second leaf having two knuckles with bores, andconnectingthe knuckles of the hinge by a pintle having an enlarged 7upper portion, and a. reduced shank, by fitting the enlarged upperportion in the bore of the upper knuckle and the reduced shank portionin said bushing and the bores of the remainingknuckles of thehinge. V

In testimony whereof I, thesaidjJAMEs P. MoKINnEY, Jr., have hereuntoset my hand. 7 a

JAMES P.- MOKINNEY, JR.

